This is a known issue (ref: SRP-6981). Obviously IE10 is something that we will be supporting but we've just not been able to do this work yet.

The workaround for now is to use another browser (Chrome, Firefox etc) or put IE10 into compatibility mode. To do this, in IE10 hit F12 and then Alt+9 (to change 'Document Mode: Standards' to 'Document Mode: IE9 standards').